Ladder



FIG. 1 is a perspective view of a ladder;

FIG. 2 is a front view of the ladder shown in FIG. 1;

FIG. 3 is a rear view of the ladder shown in FIG. 1;

FIG. 4 is a right side view of the ladder shown in FIG. 1;

FIG. 5 is a left side view of the ladder shown in FIG. 1; and,

FIG. 6 is a top side view of the ladder shown in FIG. 1.

The broken lines in the figures are shown for the purpose of illustrating boundaries of the ladder and form no part of the claimed design. 

CLAIM The ornamental design for a ladder, as shown and described. 